We can be confident that a young person professing faith in a Reformed church has a credible profession because of the Reformed tradition’s emphasis on family worship. I don’t know about you, but I never heard of the term “family worship” until I went to seminary. Not that it was an absolutely foreign concept, but surely a foreign term, and undoubtedly an un-emphasized practice. As much as I love my dad, and am thankful for the way God used him to lead me to Christ, I know he did not lead us in family worship as he ought to.
But that’s because we never grew up in a Reformed church!!! The Westminster Assembly actually wrote up a document called “the Directory for Family Worship” in the 1600’s. And it is gold! Read it when you can.
Family worship helps our children see that Jesus is Lord everyday, not just on Sunday mornings. It helps them get used to sitting and being reverent and behaving and listening to the Word of God. You can also use the time to teach children theological concepts that will help them to engage better on Sunday mornings, as well as practice reading and praying out loud. In short, the more ministry of the Word that happens in our homes supports the ministry of the Word on Sundays, and is more exposure to the means of God’s grace to convert sinners.
If the only time our children are engaging in worship is Sunday morning, it is still possible for them to be converted. That’s how powerful the Word of God is. But I am less confident in a child’s profession in those cases. But where Christ rules in the home as well, we can be sure the Spirit of God will work in the way He says He will (Romans 10.13-17, 1 Peter 1.3-25). And if a child sits under the serious ministry of the Word week in and week out, and sits under a similar ministry of the Word day in and day out, is it so surprising if they want to follow the Lord Jesus in baptism?